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valve springs

  1. 6.0 Motor problems
    ive had a p0278 for a while now, which is cylinder 6 contribution code: Diag preformed: using ford ids -powerbalance- cylinder 6 only drops out slightly (not even -20) on a hot engine only while in gear at a dead stop.( rpm raised to 900 while power braking power balance smooths out...
  2. 6.4L Performance Parts Discussion
    I was hoping some of you could give me your thoughts on what HP level/boost levels the stock valve springs would hold. My build is a step at a time as funds permit. I doubt I will ever see any huge numbers, but hope to get ‘er up to around 700ish RWHP, but it has to be RELIABLE. The heads are...
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